Glass brick



FIG. 1 is a front view of a glass brick, the rear view being identical;

FIG. 2 is a front and side perspective view of the glass brick as seen in FIG. 1;

FIG. 3 is another front and side perspective view of the glass brick as seen in FIG. 1; and,

FIG. 4 is another front and side perspective view of the glass brick as seen in FIG. 1. 

CLAIM The ornamental design for a glass brick, as shown and described. 